Click on the "add to cart" button on the items you wish to purchase or replace. From there, press the "view cart" button at the top right of the page. There is a limit of two items for warranty replacement. In addition, the digital controller, the remotes, and the retro-fit kits are for purchase only. Please call our technical support line at: 1-800-603-3398 OPT 1 ( 7AM to 7PM PST Monday-Friday and 9AM to 5PM PST Saturday/Sunday ) for warranty replacement of these items. Thank you for your support! - GMG